After the first ones I bought turned out to be fake (not even the right package, they were too narrow) I ordered a pair from another seller and these finally showed up. They're the right footprint this time at least but there are some red flags. The top had a slight texture that made me think blacktopped so I scrubbed it on a paper towel soaked in acetone and got a slight brown smudge on the towel but the numbers didn't rub off. I went ahead and installed one on the board and was disappointed to find it doesn't work, I get an approximately 4MHz square wave on pin 4 with nothing on the input, doesn't seem right but it's possible there's another fault on the prescaler board. The next red flag I noticed while photographing the ICs, they came side by side in IC tape a if they were cut from a reel but looking at the bottom they each have different stampings.
Thoughts? I just want to be 100% certain before I accuse the seller of sending me fakes and put in a claim for a refund. The lighting was different for some of the photos, they're actually the same shade however as it appears, the bottom is glossy and the tops have a bit of a texture to them.